Django'str'对象没有属性'as_widget' [英] Django 'str' object has no attribute 'as_widget'

问题描述

我已经在django中创建了一个注册表，并且创建了模板标签 add_class 来创建用户，问题是我遇到了以下错误：

I've made a register form in django and i've created a template tag add_class to create users, the problem is i'm getting this error:

'str' object has no attribute 'as_widget'

至

{{ form.username|add_class:'form-control' }}

register_user.html

register_user.html

<form class="form-horizontal" method="POST" action="">
    {% csrf_token %}
    {% if form.errors %}
        <p>Your username and password didn't match. Please try again.</p>
    {% endif %}
    <div class="form-group">
        <div class="col-md-12">
            {{ form.username|add_class:'form-control' }}
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-12">
            {{ form.email|add_class:'form-control' }}
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-12">
            {{ form.password|add_class:'form-control' }}
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-12">
            {{ form.confirm_password|add_class:'form-control' }}
        </div>
    </div>
    <div class="form-group">
        <div class="col-md-12">
            <button type="submit" class="btn btn-info btn-block">Register</button>
            <input type="hidden" name="next" value="{% url 'register_user_success' %}"/>
        </div>
    </div>
</form>

form.py

class UserForm(ModelForm):
    username = forms.CharField(widget=forms.TextInput(attrs={'placeholder': 'Username'}))
    password = forms.CharField(widget=forms.PasswordInput(attrs={'placeholder': 'Password'}))
    email = forms.EmailField(widget=forms.EmailInput(attrs={'placeholder': 'E-mail'}))
    confirm_password = forms.CharField(widget=forms.PasswordInput(attrs={'placeholder': 'Confirm Password'}))

    class Meta:
        model = CustomUser
        fields = ('username', 'email', 'password', 'confirm_password')

    def clean(self):
        cleaned_data = super(UserForm, self).clean()
        password = cleaned_data.get('password')
        confirm_password = cleaned_data.get('confirm_password')
        if password != confirm_password:
            raise forms.ValidationError('Password did not match.')

temp最新标签：my_filters.py

template tag: my_filters.py

from django import template

register = template.Library()


@register.filter(name='add_class')
def add_class(value, arg):
    return value.as_widget(attrs={'class': arg})

我制作了模板标签，以便可以从CSS添加类。

I've made the template tag so i can add classes from css.

views.py

def register_user(request):
    data = dict()
    if request.method == 'POST':
        form = UserForm(request.POST)
        if form.is_valid():
            user = form.save(commit=False)
            user.set_password(user.password)
            user.save()
            return redirect('/register_user/success/')
    else:
        data['form'] = UserForm()
    return render(request, 'register_user.html', data)

推荐答案

如果您的表单无效，则重新呈现模板，但您不会dd表单与上下文有关。因此，当模板呈现 {{form.username}} 或其他格式时，它不会找到它-找不到变量时的默认值是使用空字符串。因此，它是将空字符串传递给过滤器，因此会出现错误。

If your form is not valid, you re-render the template but you do not add the form to the context. So, when the template comes to render {{ form.username }} or whatever, it does not find it - and the default when a variable is not found is to use an empty string. So, it is the empty string that gets passed to the filter, hence the error you see.

解决方案是确保始终将表单传递给模板：

The solution is to ensure you always pass the form into the template:

else:
    form = UserForm()
return render(request, 'register_user.html', {'form': form})

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